The official National Weather Service forecast for Osage — 43.2841°N, 92.811°W, 27.1 miles from I-35.
| Mitchell County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 24 | 28 | 42 | 57 | 69 | 79 | 82 | 79 | 74 | 60 | 44 | 30 | 56 |
| Avg low °F | 8 | 11 | 24 | 35 | 47 | 57 | 61 | 58 | 51 | 38 | 26 | 14 | 36 |
| Precip in | 1.0 | 1.1 | 2.0 | 3.7 | 5.0 | 5.7 | 4.8 | 4.3 | 3.2 | 2.7 | 1.6 | 1.3 | 36.4 |
1996–2025 normals for Mitchell County — the climate division Osage sits in. All-time county record high 100.7°F (1985-06-09); record low -32.2°F (1996-02-03). Source: NOAA / National Weather Service.